Method of moulding a charge

Details Method of moulding a charge Method of moulding a charge

B - Operations, Transporting

29

C

B29C 70/34 (2006.01) B29C 43/36 (2006.01) B29C 70/44 (2006.01) B29C 70/54 (2006.01)

Patent

CA 2700414

A method of moulding a charge during the manufacture of a composite part. The method comprises: placing the charge and a diaphragm on a male tool, the charge having a first part which is positioned above a top of the male tool and a second part which projects to one side of the maletool; and progressively deforming the second part ofthe charge against a side ofthe male tool by applying a pressure difference across the diaphragm and stretching the diaphragm over the male tool as the pressure difference is applied. The diaphragm has a tensile modulus in the plane of the diaphragm which is greater than 5 MPa. Optionally a support membrane may be positioned on a opposite sides of the charge. In the case where a support membrane is used, then the diaphragm has a stiffness in the planeof the diaphragm which is higher than the stiffness of the support membrane in the plane of the support membrane.

L'invention concerne un procédé de moulage d'une charge lors de la fabrication d'une pièce composite, qui consiste: à placer la charge et un diaphragme sur un outil mâle, ladite charge ayant une première partie placée au-dessus de l'outil mâle et une seconde partie qui saille vers un côté dudit outil mâle; à déformer progressivement la seconde partie de la charge contre un côté de l'outil mâle par application d'une différence de pression à travers le diaphragme et étirage du diaphragme sur l'outil mâle à mesure que la différence de pression est appliquée. Le diaphragme présente un module d'élasticité en traction dans le plan du diaphragme supérieur à 5 MPa. Éventuellement, une membrane support peut être placée sur un côté opposé de la charge. Si une membrane support est utilisée, le diaphragme présente alors une rigidité dans le plan du diaphragme supérieure à la rigidité de la membrane support dans le plan de ladite membrane support.

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